Flexible rotor damping device and method combining TENG and semi-active NES

Abstract

The invention discloses a flexible rotor damping device and method combining TENG and semi-active NES, and belongs to the technical field of damping systems. The device comprises an auxiliary supporting bearing arranged on the middle section of the flexible rotor in a sleeving mode and power vibration reduction devices symmetrically arranged on the two radial sides of the bearing. The dynamic damping device is connected with the static end and the moving end of the fixed support through a supporting buffer spring, the moving end is integrated with a friction electrode pair of the TENG to sense vibration of the rotor in real time, and an external controller is used for converting a vibration signal into an electromagnetic adjusting instruction of the NES unit. The NES unit is coupled with a linear spring through an adjustable electromagnetic actuating mechanism, nonlinear rigidity parameters are dynamically changed, targeted dissipation of wide-frequency-domain vibration energy is achieved, and the problem that a traditional vibration reduction device is narrow in frequency band under the variable-rotating-speed working condition is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration damping systems, and relates to a flexible rotor vibration damping device and method combining a TENG and a semi-active NES. Background Technique

[0002] As the core functional component of various rotating machinery systems, the flexible rotor unit plays a pillar role in major equipment industries such as aerospace, rail transit, and ships. The stable service performance characterization of it will directly affect the life and reliability of the whole machine equipment. The research on the vibration mechanism and damping technology of flexible rotors is the foundation for ensuring its long-term stable operation. Taking the aeroengine system as an example, statistical data shows that up to 70% of the failures of aeroengine systems are caused by vibration. Especially with the continuous increase of the power-to-mass ratio and power-to-size ratio of the whole machine, the structural size and operating space of the dual-rotor are further compressed, and the vibration control of the flexible rotor unit has gradually become the key problem restricting the performance improvement of the whole aeroengine. The research on vibration damping technology based on the analysis of the flexible rotor vibration mechanism is a key technology that must be overcome in the development of the current high-end manufacturing industry and key equipment fields. Therefore, for rotating machinery systems, designing a reasonable and effective rotor vibration damping method and device is of great engineering significance and economic value. There are mainly two types of flexible rotor vibration damping methods in the current research on rotating machinery systems: (1) The first type of damping unit usually externally applies a damping effect to the rotor in the form of a flexible auxiliary support to reduce the vibration response amplitude within the main resonance range. Common actuators include squeeze film dampers, magnetorheological dampers, electromagnetic dampers, piezoresistive dampers, etc. (2) The second type of damping unit is to passively transfer energy of the flexible rotor system by adding a vibration absorber structure to improve the overall energy dissipation efficiency of the system. According to the different stiffness and damping unit characteristics of the added substructure, this type of passive vibration absorber can be further divided into linear and nonlinear forms. Among them, the most common linear dynamic vibration absorber is the Tuned Mass Damper (TMD), which tunes the natural vibration frequency of the added substructure to near the fundamental frequency of the main structure to achieve the transfer and dissipation of the vibration energy of the main structure.

[0003] However, there are some problems in the engineering applications of the above two types of flexible rotor vibration damping methods: (1) To improve the vibration suppression efficiency of the first type of vibration damping unit mentioned above, it is necessary to optimize its parameters and actively control it, which increases the probability of system instability and the operation and maintenance cost of the whole machine. Taking the squeeze film damper commonly used in aeroengines as an example, although its vibration damping efficiency at the cross-critical peak can reach more than 70%, its stable vibration damping range is narrow, and unreasonable eccentricity selection and control will lead to hysteretic jumps under the rotor bistability and the failure of the vibration damping unit. In addition, due to the strong dependence of the damping-type vibration damping device on the amplitude and speed of the main structure, it is still impossible to ensure efficient vibration damping of flexible rotors under response characteristics such as "wideband", "multi-frequency" and "multi-mechanism".

[0004] (2) Although linear dynamic vibration absorbers are widely used in the vibration damping design of linear and quasi-linear systems, due to their extreme sensitivity to the main structure and external excitation characteristics, they are easily lose the vibration damping effect due to frequency mismatch. Therefore, linear dynamic vibration absorbers are "incapable" of vibration damping of flexible rotors under strong non-linear effects. Although the vibration damping frequency band of the unit can be extended through multiple tuned mass damping devices, the additional extra mass greatly damages the integrity of the rotor system's own structure, mechanics and functions.

[0005] (3) Although non-linear dynamic vibration absorbers have been improved in terms of vibration damping frequency band, anti-interference ability and robustness compared with linear dynamic vibration absorbers, and are more suitable for vibration control of flexible rotor systems under strong non-linear effects, their vibration damping performance is relatively sensitive to their structural design parameters and external load excitation conditions, showing a great amplitude dependence. Considering the large amplitude differences of flexible rotor systems under different resonance mechanisms, the existing non-linear energy sink vibration damping structures are still unable to achieve efficient vibration damping of flexible rotor systems under the characteristics of "multi-frequency" and "multi-mechanism".

[0006] A reasonable vibration damping structure can indeed effectively reduce external disturbances, but this poses high requirements for the design of the vibration damping structure. Although there are many existing research results on vibration damping principles and methods, there are many application limitations in the special working environment of rotating machinery systems, and the vibration damping effect is extremely limited. Therefore, it is particularly important to design a reasonable and effective flexible rotor vibration damping method and device. Summary of the Invention

[0007] The purpose of the present invention is to solve the technical problems existing in the existing flexible rotor vibration damping methods, such as narrow vibration damping frequency band and inability to control multiple vibration response mechanisms, and to provide a flexible rotor vibration damping device and method combining TENG and semi-active NES.

[0008] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect of the present invention, a flexible rotor vibration damping device combining TENG and semi-active NES is provided, including an auxiliary support bearing and a dynamic vibration damping device; The auxiliary support bearing is arranged in the middle section of the flexible rotor; the flexible rotor is the object to be shock-absorbed; the dynamic shock-absorbing device is fixed on both sides of the auxiliary support bearing perpendicular to the axial direction of the flexible rotor through the auxiliary support bearing; The dynamic shock-absorbing device includes a measurement unit, a NES unit, an external controller and an external support frame; the measurement unit is connected to the auxiliary support bearing and is used for measuring the elastic runout of the flexible rotor; the measurement unit includes a support buffer spring, a fixed bracket and a nano-friction generator; the support buffer spring is connected to the fixed bracket perpendicular to the axial direction of the flexible rotor, and the fixed bracket includes a static end and a moving end; the static end of the fixed bracket is fixedly connected to the auxiliary support bearing, and the moving end is connected to the static end of the fixed bracket through the nano-friction generator; One end of the NES unit is rotatably connected to the external support frame, and the other end is rotatably connected to the moving end of the fixed bracket; The external controller feeds back the measurement result of the measurement unit to the NES unit to achieve vibration control.

[0009] Further, the nano-friction generator is arranged at the position where the moving end and the static end of the fixed bracket are connected.

[0010] Further, the nano-friction generator includes a first metal electrode and a second metal electrode; The first metal electrode is fixed to the moving end of the fixed bracket; the second metal electrode is fixed to the static end of the fixed bracket.

[0011] Further, the first metal electrode and the second metal electrode form an electrical circuit through an external circuit; the external circuit is used for receiving the electrical signal generated by the relative movement of the first metal electrode and the second metal electrode.

[0012] Further, the electrical signal received by the external circuit is fed back to the NES unit through the external controller.

[0013] Further, a first friction material is arranged on the surface of the first metal electrode; a second friction material is arranged on the surface of the second metal electrode.

[0014] Further, the NES unit includes a linear spring, a moving magnet, a fixed coil and a unit box; The fixed coil is fixed in the unit box; one end of the linear spring is connected to the moving magnet, and the other end is connected to the unit box; the moving magnet and the fixed coil are coaxially arranged; when the voltage and current of the fixed coil change, the moving magnet drives the linear spring to perform horizontal movement.

[0015] Further, a push rod is arranged along the axis of the moving magnet.

[0016] Furthermore, the NES unit further includes a sliding bearing, and the push rod forms a sliding fit with the unit box through the sliding bearing.

[0017] The second aspect of the present invention provides a flexible rotor vibration damping method combining a TENG and a semi-active NES, including the following steps: When the flexible rotor vibrates and generates radial runout, the radial runout is transmitted to the dynamic vibration damping device through the auxiliary support; An electrical signal is generated due to the relative movement between the first metal electrode and the second metal electrode of the TENG, and the electrical signal is transmitted to an external controller; The external controller adjusts the current and voltage of the fixed coil in the NES unit according to the electrical signal, so as to adjust the coupling of the electromagnetic force and the linear spring, and realize the stiffness adjustment of the NES unit; The vibration control of the flexible rotor is realized through the non-linear energy sink mechanism of the NES unit.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a flexible rotor vibration damping device combining a TENG and a semi-active NES. By using a nanogenerator (TENG), an electrical signal is generated through the relative movement between the moving end and the static end electrodes of the fixed bracket; based on the TENG sensing signal, the external controller dynamically adjusts the current intensity of the fixed coil in the NES unit, and by changing the electromagnetic force between the moving magnet and the fixed coil, the equivalent stiffness and damping characteristics of the linear spring are adjusted in real time. This non-linear adjustable mechanism can accurately match the vibration modes at different rotor speeds, significantly broaden the vibration damping frequency band; through the radial symmetric arrangement of the auxiliary support bearing and the dynamic vibration damping device, a bidirectional vibration suppression structure is formed within a limited space. The synergistic effect of the support buffer spring and the NES unit can reduce the amplitude in the critical speed area of the rotor, and at the same time avoid the problem of secondary vibration amplification caused by resonance of traditional passive vibration damping devices. A linear motion mechanism with a sliding bearing and a push rod is adopted to ensure the axial motion accuracy of the moving magnet under the action of the electromagnetic force.

[0019] Furthermore, the present invention discloses a flexible rotor vibration damping method combining a TENG and a semi-active NES. Based on the TENG, the radial runout of the rotor is converted into an electrical signal, and the external controller dynamically adjusts the current intensity of the fixed coil. By using the coupling effect of the electromagnetic force and the linear spring, the non-linear continuous adjustment of the equivalent stiffness of the NES unit is realized; combined with the targeted energy transfer mechanism of the non-linear energy sink, by adjusting the stiffness parameters of the NES unit in real time, the main vibration frequency can be automatically tracked during the change of the rotor speed, and effective vibration damping within the speed fluctuation range can be realized, avoiding the frequency band limitation problem of traditional linear vibration absorbers. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the flexible rotor vibration damping device of the present invention; Figure 2 Schematic diagram of the semi-active NES unit device in the dynamic vibration damping device of the present invention; Figure 3 Schematic diagram of the TENG integrated sensing device in the semi-active NES of the present invention; Figure 4 Schematic diagram of four different working modes of the TENG of the present invention; Among them, (a): single-motor mode, (b) contact-separation mode, (c): horizontal sliding mode, (d): independent layer mode; Figure 5 Flowchart of the implementation of the vibration damping method of the present invention; In the figure: 1 - flexible support, 2 - blade, 3 - dynamic vibration damping device, 4 - auxiliary support bearing, 5 - flexible rotor, 6 - NES unit, 7 - linear spring, 8 - support buffer spring, 9 - nanogenerator (TENG), 10 - moving magnet, 11 - sliding bearing, 12 - fixed coil, 13 - unit box, 14 - fixed bracket, 15 - external circuit, 16 - first metal electrode, 17 - second metal electrode, 18 - first friction material, 19 - second friction material. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and marked in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further definition and explanation thereof is not required in subsequent figures.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0027] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected to" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The present invention will be further described in detail below with reference to the figures: See Figures 1-4 , the present invention provides a flexible rotor vibration damping device combining a TENG and a semi-active NES, including an auxiliary support bearing 4 and a dynamic vibration damping device 3. The auxiliary support bearing 4 is arranged in the middle section of the flexible rotor 5; the flexible rotor 5 is the object to be damped; the dynamic vibration damping device 3 is perpendicularly fixed on both sides of the auxiliary support bearing 4 along the axial direction of the flexible rotor 5 through the auxiliary support bearing 4; the dynamic vibration damping device 3 is used to achieve vibration control.

[0029] The dynamic vibration damping device 3 includes a measurement unit, an NES unit 6, an external controller, and an external support frame; the measurement unit is connected to the auxiliary support bearing 4 and is used to measure the elastic jump of the flexible rotor 5.

[0030] The measurement unit includes a support buffer spring 8, a fixed bracket 14, and a nanogenerator (TENG) 9; the support buffer spring 8 is connected to the fixed bracket 14 perpendicular to the axial direction of the flexible rotor 5, and the fixed bracket 14 includes a static end and a moving end; the static end of the fixed bracket 14 is fixedly connected to the auxiliary support bearing 4, and the moving end is connected to the static end of the fixed bracket through the nanogenerator 9; the nanogenerator 9 is arranged at the position where the moving end and the static end of the fixed bracket 14 are connected. One end of the NES unit 6 is rotatably connected to an external support frame, and the other end is rotatably connected to the moving end of the fixed bracket 14; the external controller feeds back the measurement result of the measurement unit to the NES unit 6 to achieve vibration control. The nanogenerator 9 includes an external circuit 15, a first metal electrode 16, and a second metal electrode 17; The first metal electrode 16 is fixed to the moving end of the fixed bracket 14; the second metal electrode 17 is fixed to the static end of the fixed bracket 14; the first metal electrode 16 and the second metal electrode 17 are connected through the external circuit 15; a first friction material 18 is arranged on the surface of the first metal electrode 16; a second friction material 19 is arranged on the surface of the second metal electrode 17; the external circuit 15 is used to receive the electrical signal generated by the relative movement of the first metal electrode 16 and the second metal electrode 17. The electrical signal received by the external circuit 15 is fed back to the NES unit 6 through the external controller.

[0031] The NES unit 6 includes a linear spring 7, a moving magnet 10, a fixed coil 12, and a unit box 13; The fixed coil 12 is fixed inside the unit box 13; one end of the linear spring 7 is connected to the moving magnet 10, and the other end is connected to the unit box 13, which is used to provide the stiffness parameter in the NES; the moving magnet 10 and the fixed coil 12 are coaxially arranged; when the voltage and current of the fixed coil 12 change, the moving magnet 10 drives the linear spring 7 to move horizontally. A push rod is arranged along the axis of the moving magnet 10; the NES unit 6 further includes a sliding bearing 11, and one end of the push rod is fixed inside the unit box 13 through the sliding bearing 11, and the other end is rotatably connected to the moving end of the fixed bracket 14.

[0032] The flexible rotor vibration damping device combining TENG and semi-active NES of the present invention can accurately measure the elastic runout of the flexible rotor by connecting the measuring unit to the auxiliary support bearing. The measuring unit composed of the support buffer spring, the fixed bracket and the nanogenerator can sensitively capture the minute vibration of the rotor. When the relative movement occurs between the moving end and the static end of the fixed bracket of the nanogenerator, an electrical signal is generated and transmitted to the external controller through the external circuit, and then fed back to the NES unit, realizing the real-time monitoring and precise feedback of the vibration state of the flexible rotor; the NES unit adopts structures such as a linear spring, a moving magnet and a fixed coil. After the external controller processes the vibration information fed back by the measuring unit, it changes the voltage and current of the fixed coil, prompting the moving magnet to drive the linear spring to move horizontally, so as to dynamically adjust the magnitude and direction of the damping force according to the actual vibration condition of the flexible rotor. This semi-active control method can respond to vibrations under different working conditions more intelligently and efficiently compared with traditional passive damping devices, significantly improving the damping effect of the flexible rotor, reducing the damage of vibration to the equipment and prolonging the service life of the equipment. The cooperative design of the push rod and the sliding bearing makes the movement of the moving magnet in the NES unit smoother, reducing friction and wear during the movement process and ensuring the long-term stable operation of the damping device. The auxiliary support bearing is arranged in the middle section of the flexible rotor, and the structural layout with the dynamic damping device vertically fixed on both sides thereof enhances the stability and reliability of the whole device, effectively dispersing the vibration load of the rotor and improving the adaptability and working performance of the device under complex working conditions.

[0033] See Figure 5 , an embodiment of the present invention provides a flexible rotor vibration damping method combining TENG and semi-active NES, including the following steps: The flexible rotor 5 vibrates, generating radial runout; The radial runout is transmitted to the dynamic damping device 3 through the auxiliary support bearing 4; An electrical signal is generated due to the relative movement between the first metal electrode 16 and the second metal electrode 17 of the TENG 9, and this electrical signal is fed back to the external computer; The external computer adjusts the current and voltage of the fixed coil 12 in the NES unit 6 according to the feedback signal of the TENG 9, so that the moving magnet 10 drives the linear spring 7 to move horizontally, and through the coupling of the electromagnetic force and the linear spring, the adjustment of the system stiffness of the NES unit is realized; The vibration control of the flexible rotor is realized through the non-linear energy sink mechanism of the NES unit.

[0034] When the flexible rotor vibrates and generates radial runout, the damping method of the present invention quickly transfers the vibration to the dynamic vibration damping device through the auxiliary support bearing. The first and second metal electrodes of the TENG quickly generate electrical signals due to relative movement and promptly feedback them to the external computer. This process can capture the vibration changes of the rotor within an extremely short time. Compared with traditional vibration monitoring methods, it has a faster response speed and higher sensing accuracy. By utilizing the working principle of the TENG, the mechanical energy generated by the vibration of the flexible rotor is directly converted into electrical signals, achieving efficient energy conversion. The generated electrical signals not only provide data support for vibration monitoring but also serve as the source of control commands and are fed back to the external computer. Based on the signals fed back by the TENG, the external computer precisely adjusts the current and voltage of the fixed coil in the NES unit, thereby driving the moving magnet to drive the linear spring to move horizontally, realizing the dynamic adjustment of the system stiffness of the NES unit. This adjustment process can quickly and accurately change the system stiffness according to the real-time vibration state of the flexible rotor. Compared with the traditional damping method with a fixed stiffness, it can flexibly adapt to the vibration characteristics under different working conditions, greatly enhancing the adaptability and control ability of the damping system to complex vibration environments. Through the non-linear energy sink mechanism of the NES unit, the vibration energy of the flexible rotor can be efficiently absorbed and dissipated, effectively suppressing the vibration amplitude of the rotor. Compared with traditional damping methods, this control strategy based on the non-linear energy sink breaks the limitations of the linear system and can more effectively handle complex non-linear vibration problems. It can complete the target energy transfer and dissipation under various coupled resonance responses such as primary resonance, super-harmonic resonance, and sub-harmonic resonance, thereby achieving damping in a wider frequency band range.

[0035] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flexible rotor vibration damping device combining a TENG and a semi-active NES, characterized in that, It includes an auxiliary support bearing (4) and a dynamic vibration damping device (3); The auxiliary support bearing (4) is arranged in the middle section of the flexible rotor (5); the flexible rotor (5) is the object to be damped; the dynamic vibration damping device (3) is perpendicularly fixed to both sides of the auxiliary support bearing (4) along the axial direction of the flexible rotor (5) through the auxiliary support bearing (4); The dynamic vibration damping device (3) includes a measurement unit, a NES unit (6), an external controller and an external support frame; the measurement unit is connected to the auxiliary support bearing (4) and is used for measuring the elastic runout of the flexible rotor (5); the measurement unit includes a support buffer spring (8), a fixed bracket (14) and a nano-friction generator (9); the support buffer spring (8) is connected to the fixed bracket (14) perpendicularly to the axial direction of the flexible rotor (5), and the fixed bracket (14) includes a static end and a dynamic end; the static end of the fixed bracket (14) is fixedly connected to the auxiliary support bearing (4), and the dynamic end is connected to the static end of the fixed bracket through the nano-friction generator (9); One end of the NES unit (6) is rotatably connected to the external support frame, and the other end is rotatably connected to the dynamic end of the fixed bracket (14); The external controller feeds back the measurement result of the measurement unit to the NES unit (6) to achieve vibration control.

2. The flexible rotor vibration damping device combining a TENG and a semi-active NES according to claim 1, characterized in that, The nano-friction generator (9) is arranged at the position where the dynamic end and the static end of the fixed bracket (14) are connected; 3. The flexible rotor vibration damping device combining TENG and semi-active NES according to claim 2, characterized in that, The nano-friction generator (9) includes a first metal electrode (16) and a second metal electrode (17); The first metal electrode (16) is fixed to the dynamic end of the fixed bracket (14); the second metal electrode (17) is fixed to the static end of the fixed bracket (14).

4. The flexible rotor vibration damping device combining TENG and semi-active NES according to claim 3, characterized in that, The first metal electrode (16) and the second metal electrode (17) form an electric circuit through an external circuit (15); the external circuit (15) is used for receiving the electric signal generated by the relative movement of the first metal electrode (16) and the second metal electrode (17).

5. The flexible rotor vibration damping device combining a TENG and a semi-active NES according to claim 4, characterized in that, The electric signal received by the external circuit (15) is fed back to the NES unit (6) through the external controller.

6. The flexible rotor vibration damping device combining a TENG and a semi-active NES according to claim 4, characterized in that, The surface of the first metal electrode (16) is provided with a first friction material (18); the surface of the second metal electrode (17) is provided with a second friction material (19).

7. The flexible rotor vibration damping device combining TENG and semi-active NES according to claim 1, characterized in that The NES unit (6) includes a linear spring (7), a moving magnet (10), a fixed coil (12) and a unit box (13); The fixed coil (12) is fixed in the unit box (13); one end of the linear spring (7) is connected to the moving magnet (10), and the other end is connected to the unit box (13); the moving magnet (10) and the fixed coil (12) are coaxially arranged; when the voltage and current of the fixed coil (12) change, the moving magnet (10) drives the linear spring (7) to perform a horizontal movement.

8. The flexible rotor vibration damping device combining a TENG and a semi-active NES according to claim 7, characterized in that, A push rod is arranged along the axis of the moving magnet (10).

9. The flexible rotor vibration damping device combining a TENG and a semi-active NES according to claim 8, characterized in that, The NES unit (6) further includes a sliding bearing (11), and the push rod forms a sliding fit with the unit box (13) through the sliding bearing (11).

10. A flexible rotor vibration damping method combining a TENG and a semi-active NES, based on the flexible rotor vibration damping device combining a TENG and a semi-active NES described in claim 1, characterized in that, It includes the following steps: When the flexible rotor vibrates and generates radial runout, the radial runout is transmitted to the dynamic vibration damping device through the auxiliary support; An electrical signal is generated due to the relative movement between the first metal electrode and the second metal electrode of the nanogenerator, and the electrical signal is transmitted to an external controller; Based on the electrical signal, the external controller adjusts the current and voltage of the fixed coil in the NES unit, thereby realizing the stiffness adjustment of the NES unit by adjusting the coupling of the electromagnetic force and the linear spring; Through the non-linear energy sink mechanism of the NES unit, the vibration control of the flexible rotor is realized.

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